Pressure indicating and recording apparatus.



n W. H. BRISTOL.v PRESSURE INDIGATING AND RECORDING APPARATUS. APPLICATION FILED NOV. 12, 1910.

1,000,892, Patented Aug. 15, `1911.

.Ill 111.11111 1111111111111" trolled, or both.

50' be 'made-to riseequal amounts for .'WI-LLIAM H. BRISTOL, 0F WATERBURY, CONNECTICUT.

PRESSURE INDICATING if: ":TD RECORDING APPARATUS.

Specification of Letters Patent.

raient-qu Aug. 15, 1911.

` fnl 1 Application filed November 12, 1910. Serial No. 591,963.

To all vwhom it may concern: Be it known that L-'VILLIAM H. B Rrs'roL, a citizen of the United States, and a resident. of "Waterbury, in the county et New Haven and State of Connecticut, have invented certain new and useful Improvements lin Pressure Indicating and Recording Apparatus', of `which the following isa specification.

-My'inventon relates to indicating and recordlng apparatus, and particularlyr to devicsfof'jthis character whereby differential lpressures ,in be readily indicated 0r re- ,ijf corded-D f'f- "f'Ithns-foriits'object to provide a difieren lftltiljressure gage whose indicating and re "2iionzlifngarm'v shall be directly actuated by the rise''and fall of a column of a suitable uids'ubjected to the o posing pressures. f 5 has for lits further object to so construct jt'rhe'apparatus thatzthe rise' and fall of 4the column of liquid, and the movement of the dicating v"or recording arm, isl made to 'conform toa particular law, whereby the I l dications or records ofthe instrument may I., bmdesubstantially uniform and express J"`fdiifelctly sofne physical quantity. For ex- 't"`a.'ir'i'plc'f,g if the apparatus be designed to read 'I in "volumes of gas or liquid flowing throu h i 1- a 'main,' the differential pressures esta lished', as by means of a Venturi meter, "would ordinarily Aatlect the indications, I4"fwhich correspond tothe volume flowing, suche manner that the same would be oportional tothe' square root of the difp "gli,"` rencesof pressureestablished. For equal increase. of volume owing, however, it will be'freadily understood' thatsuch4 rapid dei crease lof the indications is extremely objetina'blef';V and tothisend suitable provi- :4Q-sionliasbeenmadeto regulate the rise and 'I fall pf the column of liquid, actuating the 1-.indicatin or-recording means, in such a manner t at-'the rapid increase of pressure does not raise the said column, or affect the `i5 indicating arm, proportionally. The con- `forrnationjof the fluid-container or contain- Vers is for this purpose suitably altered to ermitthe,columnlof-liquid-.to follow the 'law of variation, that isthecolumn may ual volumes flowino, although the differential pres, sures 4`esta-bhshed thereon increase as' the square of the volume; or, the -movement of fthe indicating arm may be suitably vcon- 'l`he nat-ure of my invention will be best understood when described in connection with the accompanying drawings, in which- Figure lyis an elevation, partly in section,v

oi the apparatus; and Fig. is a horizontal section taken on the line 2 2, Fig. 1.

.Similar characters of reference designate ctn-responding parts throughout the several views.

Referring now to the drawings, 10, 11 and 12 designate casings forming corresponding pressure chambers 13, 14 and l5, said casings being suitably mounted upon a base 16 which isV arranged to be set level b means of leveling screws 17. Suitable pipe -connections 18 and 19 are provided between the chambers 13 and 14, and the chambers 14 and 15 respectively, the chambers 14 and 15 being also connected at the top through a suitable pipe connection 20. .The various pipes are preferably made so as to be exible, for the purpose of effecting the initial a'djustmentof the apparatus which is made with the base 1"6 perfectly level. In setting up the apparatus at some different place, it is then necessary merely to level the base 16 by means of the leveling screws 17, the pressure chambers, after havin once been set properly at the initial adjlustment, being secured in place by screws 21 or the like.

-The chamber 13 may, in effect also, be

extended below chamber 14 by lengthening the connection 18 between the same, so that the apparatus may be readilyadapted fo different. total` ranges of pressure.

Means, such as the inlet 22 to the pressure 'chamber 13, are provided for the introducsure, and 28 the inlet for the lower pressure,

the difference' of which two pressures is to be indicated or recorded. These pressures may be established in various ways, for example-by means of a Pitot tube or a Venturi meter. In the latter -case, if the two pressures established by the Venturi meter be ein loyed to' determine the volume of Huid i owing through the same,th e differences-of pressure established thereby will be proportional to the square of the volume lfioafing. VF or equal increments of increase of volume, therefore, the differences of increase of pressure established will not. be

sure chamber 13', and the casing 12 formingA likewise the pressure chamber 14:, the two ca-sings together forming a U-tube apparatus. vThe latter chamber contains the actuating meclianisrgfy for an indicating 0r recording :irin 3(j-. arranged to more over a suitable chart 31 desired, and which chart is rotated in the ual manner by mechanism not shown.- "be additional casing forming the pressure chamber 15 is merely:

auxiliary, and its purpose will be hereinafter explained. The actuating mechanism for the indicating or recording arm 30 consists of a suitable 4iioat 33. held by arms 34, and is adapted to move about.' an axis 35.Within the vpressure chamber 14, which chamber is preferably curved.' The' arms 34 are secured to shafts 36' terminating at one end in cones fitting corresponding bearings 37 provided therefor in the casing 11.

. One of the arms 34 issecur'ed 'to its sha-ftby y40 means of a suitable lock nut 38, and the said shaft 3G is extended to pass through the Wall 39 of the ca sing and carries at its outer end the -indicating or recording arm 30. The other arm 34e is riveted to its Shaft, or

otherwise suitably secured thereto. A suitable stuiiing box 40 is p'rovi'ded'to pass the extended shaft ythrough the .Wall 39. The

indicating -or recording arm thus secured to fectproduced may be an increasing or .de--

creasing ldeflection forequal increments of rise of the tioat. f U5 To provide forthe uniform deflection of equal, .said differences of pressure 'increasf By locating` thel ofthe differences of pressure by the quantity to be measured. For example, inl the case hereinbefore referred to, the. increas- 8c ing volume causesi ditl'erence of pressure to be established proportional to the square of the volume. Thus, two units of volume -Will establish a pressure of four: and threeunitsl of volume, a pressure of nine. I, therefore, so shape one or more of the chambers orin any mannercontrol the-delivery of liquid, for yexample from the chamber 13, thatas the pressure increases thereon less liquid is delivered to the chamber 14 in pro-v 910 portion tothe increase ofpressure. In the drawings I have indicated 'this by making .the bottom of the chamber inclined; but I v do notwish to restrict myself to this particular conformation, as ltvis evident that the same effect may be obtained in many different ways, the proper conformation being determined bv trial. The variation of themovement of the ioat,'due to its angular position, as explained, maybe combined 10G with the aforesaid means to' obtain thedesired result. To distribute the effect Vproduced by altering the conformation' of `the. chambers and'to more satisfactorily obtain l, the same, I prefer to employ the auxiliaify' chamber 15 which communicates With-the chamber 14, and the bottom of which is also inclined. The eifect'in this chamber, how-1 ever, is the reverse of that in chamber 13 which is part of the other leg 'of the U-tube, the' liquid rising more slowly, owing to the increased area, upon increase of pressure in the chamber 13. This thus further' serves to prevent the rapid rise of liquid cha-mber 14. j.

I prefer to make the connections vbetween the various chambers fiexible', 'in order thatv the same may be tilted, if desired, before I being yfixed, to obtain the proper grammtions ofthe scale over which thear'mBOis' ,adapted to move.

Tov allow for a greater total nangevof difference of pressurerto bemeasured bythe same apparatus, the chamber 13 may in veffect beextended any. desired distance be- 1.25 low the level of float as by lengthening the connection 18,'as shown, 'Iclaim:-'

In an apparatusv forv indicating and' recording pressures: a' plurality of casings' IQ Loodsen, 3 r

r formin foommnieating pressure chambers 'oontained vin one of said chambers, fioeting' on said liquid therein 4sind adapted tojfiri take of the rise and Vfail] of the same; arms secured at one end v'tof sind floating means,

sind at the other. end r'ivotally secured to said easing; Yan 'arbor extending "from one of said' arms and adapted izo-pass through arm secured to said arboroutside ofthe seid to retain a, suitable liquid; Ineens easing. l A

Signed at New York, in the county ofI New AYork and State of New York this llhday of Nov. A. D. 1910. i

i WILLIAM H. BRISTOL. VVritIiessesr-A t V l LAURA E. SMITH,

FREDLF. SoHU'n'rz. 

